diff --git a/base/internal/message.cpp b/base/internal/message.cpp
index fa558caa11..5b656e1b73 100644
--- a/base/internal/message.cpp
+++ b/base/internal/message.cpp
@@ -36,7 +36,7 @@ namespace internal
 std::string ToUtf8(std::u16string_view utf16)
 {
   std::string utf8;
-  utf8::unchecked::utf16to8(utf16.begin(), utf16.end(), utf8.begin());
+  utf8::unchecked::utf16to8(utf16.begin(), utf16.end(), std::back_inserter(utf8));
   return utf8;
 }